AA 880 then UA 4645 at O'Hare
Philadelphia → Chicago → Fort Wayne
Timetable, Chicago time
12:19AA 880 from Philadelphia at the gate
11:25UA 4645 to Fort Wayne leaves the gate
23 h 06 apart on the timetable, overnight
UA 4645 leaves 23 h 06 after AA 880 arrives on the timetable: more than half a day, so not a connection we count.